diff mbox series

[v4,2/2] usb: typec: tps6598x: Export some power supply properties

Message ID ee2df27df04e6ff01d15255665458be1000dcfa8.1606827507.git.agx@sigxcpu.org (mailing list archive)
State Superseded
Headers show
Series usb: typec: tps6598x: Export some power supply properties | expand

Commit Message

Guido Günther Dec. 1, 2020, 12:59 p.m. UTC 
This allows downstream supplies and userspace to detect
whether external power is supplied.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 drivers/usb/typec/Kconfig    |   1 +
 drivers/usb/typec/tps6598x.c | 105 +++++++++++++++++++++++++++++++++++
 2 files changed, 106 insertions(+)

Comments

Andy Shevchenko Dec. 1, 2020, 1:52 p.m. UTC | #1 
On Tue, Dec 1, 2020 at 2:59 PM Guido Günther <agx@sigxcpu.org> wrote:
> This allows downstream supplies and userspace to detect
> whether external power is supplied.

...

> +static int devm_tps6598_psy_register(struct tps6598x *tps)
> +{
> +       struct power_supply_config psy_cfg = {};
> +       const char *port_dev_name = dev_name(tps->dev);

> +       size_t psy_name_len = strlen(tps6598x_psy_name_prefix) +
> +                                    strlen(port_dev_name) + 1;

I'm so sorry by not noticing this one...

> +       char *psy_name;
> +
> +       psy_cfg.drv_data = tps;
> +       psy_cfg.fwnode = dev_fwnode(tps->dev);
> +       psy_name = devm_kzalloc(tps->dev, psy_name_len, GFP_KERNEL);
> +       if (!psy_name)
> +               return -ENOMEM;
> +
> +       snprintf(psy_name, psy_name_len, "%s%s", tps6598x_psy_name_prefix,
> +                port_dev_name);

...followed by this.

Please, use devm_kasprintf() instead.
Guido Günther Dec. 1, 2020, 1:56 p.m. UTC | #2 
Hi Andy,
On Tue, Dec 01, 2020 at 03:52:40PM +0200, Andy Shevchenko wrote:
> On Tue, Dec 1, 2020 at 2:59 PM Guido Günther <agx@sigxcpu.org> wrote:
> > This allows downstream supplies and userspace to detect
> > whether external power is supplied.
> 
> ...
> 
> > +static int devm_tps6598_psy_register(struct tps6598x *tps)
> > +{
> > +       struct power_supply_config psy_cfg = {};
> > +       const char *port_dev_name = dev_name(tps->dev);
> 
> > +       size_t psy_name_len = strlen(tps6598x_psy_name_prefix) +
> > +                                    strlen(port_dev_name) + 1;
> 
> I'm so sorry by not noticing this one...
> 
> > +       char *psy_name;
> > +
> > +       psy_cfg.drv_data = tps;
> > +       psy_cfg.fwnode = dev_fwnode(tps->dev);
> > +       psy_name = devm_kzalloc(tps->dev, psy_name_len, GFP_KERNEL);
> > +       if (!psy_name)
> > +               return -ENOMEM;
> > +
> > +       snprintf(psy_name, psy_name_len, "%s%s", tps6598x_psy_name_prefix,
> > +                port_dev_name);
> 
> ...followed by this.
> 
> Please, use devm_kasprintf() instead.

Will do. I'll let the series sit for a couple of days before sending a
v5.
Cheers,
 -- Guido

> 
> -- 
> With Best Regards,
> Andy Shevchenko
>
diff mbox series

Patch

diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig
index 772b07e9f188..365f905a8e49 100644
--- a/drivers/usb/typec/Kconfig
+++ b/drivers/usb/typec/Kconfig
@@ -64,6 +64,7 @@  config TYPEC_HD3SS3220
 config TYPEC_TPS6598X
 	tristate "TI TPS6598x USB Power Delivery controller driver"
 	depends on I2C
+	select POWER_SUPPLY
 	select REGMAP_I2C
 	select USB_ROLE_SWITCH
 	help
diff --git a/drivers/usb/typec/tps6598x.c b/drivers/usb/typec/tps6598x.c
index 3db33bb622c3..d7fc2813b4ee 100644
--- a/drivers/usb/typec/tps6598x.c
+++ b/drivers/usb/typec/tps6598x.c
@@ -9,6 +9,7 @@ 
 #include <linux/i2c.h>
 #include <linux/acpi.h>
 #include <linux/module.h>
+#include <linux/power_supply.h>
 #include <linux/regmap.h>
 #include <linux/interrupt.h>
 #include <linux/usb/typec.h>
@@ -55,6 +56,7 @@  enum {
 };
 
 /* TPS_REG_POWER_STATUS bits */
+#define TPS_POWER_STATUS_CONNECTION	BIT(0)
 #define TPS_POWER_STATUS_SOURCESINK	BIT(1)
 #define TPS_POWER_STATUS_PWROPMODE(p)	(((p) & GENMASK(3, 2)) >> 2)
 
@@ -96,8 +98,25 @@  struct tps6598x {
 	struct typec_partner *partner;
 	struct usb_pd_identity partner_identity;
 	struct usb_role_switch *role_sw;
+	struct typec_capability typec_cap;
+
+	struct power_supply *psy;
+	struct power_supply_desc psy_desc;
+	enum power_supply_usb_type usb_type;
+};
+
+static enum power_supply_property tps6598x_psy_props[] = {
+	POWER_SUPPLY_PROP_USB_TYPE,
+	POWER_SUPPLY_PROP_ONLINE,
 };
 
+static enum power_supply_usb_type tps6598x_psy_usb_types[] = {
+	POWER_SUPPLY_USB_TYPE_C,
+	POWER_SUPPLY_USB_TYPE_PD,
+};
+
+static const char *tps6598x_psy_name_prefix = "tps6598x-source-psy-";
+
 /*
  * Max data bytes for Data1, Data2, and other registers. See ch 1.3.2:
  * https://www.ti.com/lit/ug/slvuan1a/slvuan1a.pdf
@@ -248,6 +267,8 @@  static int tps6598x_connect(struct tps6598x *tps, u32 status)
 	if (desc.identity)
 		typec_partner_set_identity(tps->partner);
 
+	power_supply_changed(tps->psy);
+
 	return 0;
 }
 
@@ -260,6 +281,7 @@  static void tps6598x_disconnect(struct tps6598x *tps, u32 status)
 	typec_set_pwr_role(tps->port, TPS_STATUS_PORTROLE(status));
 	typec_set_vconn_role(tps->port, TPS_STATUS_VCONN(status));
 	tps6598x_set_data_role(tps, TPS_STATUS_DATAROLE(status), false);
+	power_supply_changed(tps->psy);
 }
 
 static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
@@ -467,6 +489,85 @@  static const struct regmap_config tps6598x_regmap_config = {
 	.max_register = 0x7F,
 };
 
+static int tps6598x_psy_get_online(struct tps6598x *tps,
+				   union power_supply_propval *val)
+{
+	int ret;
+	u16 pwr_status;
+
+	ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
+	if (ret < 0)
+		return ret;
+
+	if ((pwr_status & TPS_POWER_STATUS_CONNECTION) &&
+	    (pwr_status & TPS_POWER_STATUS_SOURCESINK)) {
+		val->intval = 1;
+	} else {
+		val->intval = 0;
+	}
+	return 0;
+}
+
+static int tps6598x_psy_get_prop(struct power_supply *psy,
+				 enum power_supply_property psp,
+				 union power_supply_propval *val)
+{
+	struct tps6598x *tps = power_supply_get_drvdata(psy);
+	u16 pwr_status;
+	int ret = 0;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_USB_TYPE:
+		ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
+		if (ret < 0)
+			return ret;
+		if (TPS_POWER_STATUS_PWROPMODE(pwr_status) == TYPEC_PWR_MODE_PD)
+			val->intval = POWER_SUPPLY_USB_TYPE_PD;
+		else
+			val->intval = POWER_SUPPLY_USB_TYPE_C;
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		ret = tps6598x_psy_get_online(tps, val);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static int devm_tps6598_psy_register(struct tps6598x *tps)
+{
+	struct power_supply_config psy_cfg = {};
+	const char *port_dev_name = dev_name(tps->dev);
+	size_t psy_name_len = strlen(tps6598x_psy_name_prefix) +
+				     strlen(port_dev_name) + 1;
+	char *psy_name;
+
+	psy_cfg.drv_data = tps;
+	psy_cfg.fwnode = dev_fwnode(tps->dev);
+	psy_name = devm_kzalloc(tps->dev, psy_name_len, GFP_KERNEL);
+	if (!psy_name)
+		return -ENOMEM;
+
+	snprintf(psy_name, psy_name_len, "%s%s", tps6598x_psy_name_prefix,
+		 port_dev_name);
+	tps->psy_desc.name = psy_name;
+	tps->psy_desc.type = POWER_SUPPLY_TYPE_USB;
+	tps->psy_desc.usb_types = tps6598x_psy_usb_types;
+	tps->psy_desc.num_usb_types = ARRAY_SIZE(tps6598x_psy_usb_types);
+	tps->psy_desc.properties = tps6598x_psy_props;
+	tps->psy_desc.num_properties = ARRAY_SIZE(tps6598x_psy_props);
+	tps->psy_desc.get_property = tps6598x_psy_get_prop;
+
+	tps->usb_type = POWER_SUPPLY_USB_TYPE_C;
+
+	tps->psy = devm_power_supply_register(tps->dev, &tps->psy_desc,
+					       &psy_cfg);
+	return PTR_ERR_OR_ZERO(tps->psy);
+}
+
 static int tps6598x_probe(struct i2c_client *client)
 {
 	struct typec_capability typec_cap = { };
@@ -560,6 +661,10 @@  static int tps6598x_probe(struct i2c_client *client)
 		goto err_role_put;
 	}
 
+	ret = devm_tps6598_psy_register(tps);
+	if (ret)
+		return ret;
+
 	tps->port = typec_register_port(&client->dev, &typec_cap);
 	if (IS_ERR(tps->port)) {
 		ret = PTR_ERR(tps->port);